A constant current flows in a horizontal

Question:

A constant current flows in a horizontal wire in the plane of the paper from east to west as shown in figure. The direction of magnetic field at a point will be north to south.

(a) directly below the wire

(b) directly above the wire

(c) at a point located in the plane of the paper, on the north side of the wire

(d) at a point located in the plane of the paper, on the south side of the wire.

Solution:

(d).
Explanation : Applying right hand thumb rule to know the direction of the magnetic field.

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